Node to help: http://wiki.ros.org/dynamic_reconfigure
There is a tutorial for how to do this as well: http://wiki.ros.org/dynamic_reconfigu...
This question and answer will help you a lot if you want to do it in C++. NOTE: the push_back use in the answer code creates issue but the rest of it is good. I used this as a start for my code below : https://answers.ros.org/question/1227...
You'll see move base has a service called "/move_base/set_parameters". That is the service call you'll substitute into code below.
And finally how I do it in C++ for raspicam node. I am using integers. You'll need to use floats or doubles for inflation radius.
#include <dynamic_reconfigure/DoubleParameter.h>
#include <dynamic_reconfigure/Reconfigure.h>
#include <dynamic_reconfigure/Config.h>
dynamic_reconfigure::ReconfigureRequest srv_req;
dynamic_reconfigure::ReconfigureResponse srv_resp;
dynamic_reconfigure::IntParameter integer_param;
dynamic_reconfigure::Config conf;
int cameraControl(int ss, int iso)
{
conf.ints.resize(2);
ROS_INFO_STREAM("ROBOT-STATE: cameraControl: shutter_speed: " << ss << "\tISO : " << iso);
integer_param.name = "shutter_speed";
integer_param.value = ss;
conf.ints.at(0) = integer_param;
integer_param.name = "ISO";
integer_param.value = iso;
conf.ints.at(1) = integer_param;
srv_req.config = conf;
ros::service::call("/raspicam_node/set_parameters", srv_req, srv_resp);
return 1;
}